How people could be so disappointing and ungrateful?

Some time ago a friend of mine warned me about a girl that was using my pics and she was asking for review copies for her blog, when my friend confronted her about she are using my pics she said that i'm her friend (lie). When i knew this she filled me with a lot of bad lies but i forgave her instead reporting her.
I felt good thinking i was making my good action, being nice and giving a change to that girl, i was so naive that i until put her blog in my blogroll to help her for she doesn't do this stupid things anymore.

Last days i checked her blog and i was very surprised when i saw her posts totally the same as mine.
I'm not angry for she using the same things as me including in similar dates, because i'm not a selfish person ...when someone ask me something about my blog i always answer with all pleasure...i was angry because everything i did for her how she was capable?
And the worst is...i was talking to her again to ask her why??? and she was so arrogant and ignorant, she accused me of copying her pics but my blogposts comes first because of my rl time (she even doesn't know my rl time) she insulted me and she didn't stopped saying that i'm nothing bla bla bla (what a silly and childish person i thought).

I hate making drama, i'm always very quite and as you know, my dear followers,  i never talk in my blogposts, and in 3 years of blogging i never had issues with anybody, but i'm so frustrated with is that i need to talk about.

I have one question in my mind...where are the values? how people could be so petty? I know that i'm talking about only a game, but politeness is always good in any situation and principally because i wasn't rude with her!
Those girl's actions make me be regretful of being a good person when i talked to her first time!
Sometimes this world is so upside down!

Sorry for this long text in a bad english!
Have a sweet weekend!

Lee ♥